Steam boiler



jam, 16, i923.

E. KIDWELL.y STEAM BOILER.

2 SHEETS-SHEET 2 FI LED Nov v22 l 921 onirico sra'iss carenti onirica.

EDGAR KIDWELL, F MILWAUKEE, WISCONSIN.

STEAM BOILER.

Application filed November 22, 1921. Serial No. 516,997.

T 0 ZZ fui/0m t may concern.' and 12 the outlet or breeching to the snioke- 55 13e it known that I, EDGAR KIDWELL, a stack at the rear of the setting. citizen of the United States, and resident of 13 designates a mud drum at the rear of ilwaukee, iii the county of Milwaukee and the bridge wall of the furnace; let a water State of llisconsin, have invented certain drum located above the forward portion of new and useful Improvements in Steam the furnace and below the normal water- 60 Boilers, of which the following is a. specilevel, and 15, 16 two steam-and-water cation. drums arranged above the drums 13, 14, This invention relates to steam boilers; respectively. The drums 15, 16 are located l0 having reference, more particularly, t0 that partly above and partly below the normal type of boilers wherein transverse reeeptawater-level, thus providingin each a lower 65 cles and associated banks of water tubes, Water-Space 17 and an upper steam-space together with suitable baffling, are em- 18. The feed-water pipe 19 leads into the ployed, and wherein at least two of said rerear drum 15. The drums 13, 14 and 15 are ceptacles are arranged partly above and connected in succeeding order by banks of partly below the normal level of the boiler tubes 20, 21, 22 respectively, thus providing 70 Water in order to constitute steam-andav continuous circulation path for the water; water receptacles, whereof the respective and baffles 23 are suitably-disposed in relasteam-spaces are connected directly or iution to Such bankS iii Order to dileCt the hot directly by suitably-disposed drying` or and other products of combustion superheating tubes adapted to conduct the through appropriate passes from the front 75 steam, which is liberated from the water in tothe real' of the apparatus, whereby a conone receptacle, to the steam-space of the tinuous circulation of the water through the other receptacle preparatory to the disdrums and tubes is effected.

25 charge of the steam for service. The steam-space of the rear upper drum A boiler of the type mentioned is illus- 15 is connected with the similar space of the 80 trated in my Letters Patent of the United front upper drum 16 by means of a series of States No. 1,348,179, dated August 3, 1920; tubes 24 which are preferably arranged the apparatus therein disclosed embodying within the path of the hot gases from the.

main and supplemental water circulation furnace, whereby the steam as rapidly as it paths so co-ordinated that the true level of is liberated from the water in the drum 15 85 the water within the steam-discharge recapflows into the steam-space of the front uptacle is correctly indicated, irrespective of per drum 16. such steam, during its passage the fluctuations of the water-level i in the through the tubes 24, being efectually dried Steanpdisengagng receptacle or other reor superheated. The drum 16 is provided mote portion of the boiler, or the` rate at with a discharge portion 25 tlirouglrwhich 90 which the boiler is being operated. the dry or superheated steam as rapidly as The present invention may be described it is produced is taken olf for service. This as an improvement in or modification of the drum is also provided with a water-column,

construction described in said Letters Patincluding the gage glass 29.

ent. and particularly with respect to the The parts above referred to are similar in 95 supplemental water circulation path, as will construction and'operation to the like-iiamed be hereinafter described and claimed. parts described in the patent aforesaid.

In the drawings` ln my prior construction water is diverted i Figure 1 is a longitudinal vertical section vfrom the front water drum through suitof a boiler of the transverse drum type eruable tubo connections into the front steain-4 100 bodyiiig the principle of my invention. and-water drum which is outside the main Fig. 2 is a partial section showing the path of: circulation, such diverted water besteam-and-water'drums and the circulatory ing` thence directed through suitable tube tube connections therebetween. connections to the rear steam-and-waier Fig; 3 is a similar view illustrating a moddrum which is included in the main path ol' 105 ification of the tube connections. circulation; the water thus diverted being Referring to. the drawings, 10 designates of such volume that a steady water level iii theboile-r setting 1 1 the furnace therein, the front steam-and-water drum is maintained, irrespective of the disturbance of the water in the rear steam-and-water drum, or other remote portion of the boiler.

According to -my presenti inventionI dis*- pense entirely with the tube connection between the two front drums 111-, 16, and l connect the iront and rear 'steamand-water drums in such a manner that there is effected and maintained between the two drums 15, 16 a continuous water circulation which ensures a steady level of water within the front steam-and-water drum; such connection, together with the front.steam-and-water drum, thus constituting a supplemental path through whicha portion or' the main body'of water is diverted from the mainpath of circulation.

The circulating .connections between the drums 15, 16 comprise tubes 26, .27, respectively, which are so arranged in thefheating zone `of the ifurnace .that -`thexwater .is

caused to flow from therear drum to= the front drum through the connection 26, and then to return from the front to the rear drum through the vconnection 27. .The volume of water circulating through the supplemental path constituted by the tubesz26, 27 .and the :trontdrum 16is such as to. ensure a constant level of thewater within the latter irrespective of. the iiuctuationsof` the water within the steam-disengaging receptacle or other remote portion oi' the boiler, or the rate at which .the boiler is being operated. The area of the tubes 26,127 in relation to that of the banks-ot tubes withinthe vmain path ofcirculation will,` of coursepvarywith theisize of the boiler.

One or more tubes-.26 maybe employed, the-same, ini the preferred form, being slightly curved downwardly adjacent the #rear drum and then inclined upwardly Iin Yits path vto the yfronty drum. The connection of7 the tubeA or tubes 26-with the rear drum is made relatively low, while the connectionwith lthe front drum is `made on a higher plane but'below the water line. Hencel provision `is had for afsteady and constant `iow of water-fromthe rear to the front drum. The tube or tubes l2'7 correspond-:in capacity with the itube ortubes T26, and Vin the prelerred form are curved vdownwandlyat lor fadj acent-.theylower'portion ofthe'front drum andthentinclined i .upwardlyv in its :path to the rear drum. rfPreferably, though not'nec- 7 isy constitutedby oneY or more ofthe tubesofthe `bank 21, such tube .or f tubes beingndeflected .up-

wardly at theirftorwar'd' ends-I and-connected.

withthe steanrandwateridrum 16 instead of with the waterdrum14. Hence provision is had for fa constantwflow of water-'from the fifront tothe: rear drum,v .corresponding with ythe 4gtlovvdrunl the l:rea-rito the rontfdruin, fand, 1n vconsequence, the water-line -of :the

Vtrent drumris maintained y.practical-ly conyany desired angle by .one rof said yconnections being 4the tube '26"isfprovided with one curved end which enters the adjacent drum, but it is to lbe understood that I do not limit my invention to any tube arrangement having a curved end. or ends. Thus, Jfor example, straight tubes may he employed, as shown in Fig. 3, such tubes `entering the drum at using suitable pads.

It is .also to be .understood that I .do not limit .my invention to any arrangement ,in which the tubes cross each other, for the reason.. that if drums of suiiicient diameter were provided tube 26 could be placed directly above tube 27 .or vice versa.

I claim* l.1. A. steamboiler having a continuous main water circulation path .and a supplemental. water` circulation path, said main path including a steam-and-water receptacle wherein the steam is disengaged from the water, and said supplemental path comprisingra steam-and-water receptacle from which the steam is discharged from the boiler, said latter receptacle being outside the main path of circulation,.and said supplemental path also comprising two tube connections between thewater spacesof the two receptacles, inclined upwardly .in its path. from the steam-disengaging receptacle tothe steam-discharging receptacle, and .the other connection' being inclined upwardly in its path from the steam-discharge `receptacle tothe other receptacle.

2. A water-tubeboiler having front and rear transverse steam-and-water drums, a front water drum`r aI rear `mud drum, a bank of tubes connecting said mud drum to the `water drum, asecond bank of tubes connecting said water drum to the rear'steain-andwater drum, a third bia-nk of tubes connecting said rear drumto the mud drum, supplement-al circulating tube connections betweenfthe water -spaces of 'the steam-andwater drums, oneo'fsaid connections being inclined upwardly in itc-'path Jfrom the rear ntothe front driimfand the'other connection water, and "said `supplemental path vceinprising a steaman il-water receptacle from which the steain is discharged .trom the boiler7 said latter receptacle being outside the main path of circulation, and said supplemental path also comprising two tube connections between the water spaces of the two receptacles, one of said connections beinginclined upv-:ardly in its path from the steam-disengaging receptacle to the. stealndischarging receptacle, and the other connection'being deflected downwardly at the lower portion of the steam-discharging receptacle and then inclined upwardly in its path to the other receptacle, and steamconducting means between the steam spaces ot' the two receptacles.

4. A steam boiler having a continuous main water circulation path and a supplemental water circulation pat-h, said main path including a steam-and-water receptacle wherein the steam is disengaged from the water, and said supplemental path cornprising` a steamsand-water receptacle from which the steam is discharged from the boiler, said latter receptacle being outside the main path of circulation, and said supplemental path also comprising two tube connections between the water spaces of the two receptacles, one or' said connections being' inclined upwardly in its path from the steaxn-disengagging` receptacle to the steamdischarging receptacle, and the other conncction being deflected thirwnwardly at' the lower portion of the steamdischarging receptacle and then inclined upwardly in its path to the other receptacle, said connections heine` in the heating; Zone of the turnace7 and steaniconducting means between the steam spaces ot the two receptacles.

5. Av water-tube boiler having` front and rear transverse steam-and-water drums, a front water drinn, a. rear mud drum, a bank of tubes connecting' said mud drum to the water drum, a second bank of tubes connecting said water drum to the rear steamand-water drum, a third bank of tubes connecting said rear drinn to the mud drum, supplemental circulating tube connections between the water spaces of the steam-andwater drums, one ot said connections being inclined upwardly in its path `from the rear to the front drum and the other connection being` deflected downwardly at the lower portion of the front drum and then inclined upwardly in its: path to the rear drumj said connections being in the heating Zone of the furnace, and superheater tubes connecting the steam spaces of the front and rear steam-andewater drums.

Signed at lllilwankee in the county of ll/.lilwanltee and State ot Wisconsin this 19th day of November A. l). 1921.

EDGAR llDWllLL. 

